Starting method and system for permanent magnet synchronous motor

Abstract

The invention is applicable to the motor control field, and provides a starting method and system for a permanent magnet synchronous motor. On the basis of a static coordinate system and a rotor coordinate system that are frequently used in a mathematic model of the permanent magnet synchronous motor, a starting coordinate system is additionally introduced to enable an open loop run phase of the permanent magnet synchronous motor to be operated in the starting coordinate system; a closed loop run phase is converted from the starting coordinate system into the rotor coordinate system, so that the problem of jumping current and rotor speed when the permanent magnet synchronous motor is in transition from the open loop run phase to the closed loop run phase is solved, and the starting process of the permanent magnet synchronous motor can be smoothly and naturally performed; meanwhile, when the starting parameters and loads of the motor are obviously changed, the starting of the permanent magnet synchronous motor is controlled by the starting method and system provided by the invention without affecting the smoothness of the starting of the permanent magnet synchronous motor; and in addition, the starting method is high in robustness and applicable to wide promotion and use.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a starting method and system for a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor control methods all require the position information of the rotor. The detection of the rotor position can use an external position encoder or a reverse electromotive force detection method. The latter cancels the hardware position sensor and uses a software algorithm to collect the current and voltage of the motor coil. and other information to calculate the position of the rotor. However, before the motor starts, because there is no back electromotive force, the rotor position information cannot be obtained, resulting in the inability to carry out subsequent control of the permanent magnet synchronous motor. In the prior art, the usual method is to adopt the start-up mode of forced drag, that is, to apply a predetermined current in...

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Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a method and system for starting a permanent magnet synchronous motor, which aims to solve the problem of the algorithm used in the open-loop to closed-loop operation of the permanent magnet synchronous motor in the prior art, and the effect is not ideal, so that The problem of strong vibration and low robustness during the starting process of the motor

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